CN102103840B - Driving method for local dimming of liquid crystal display device and apparatus using the same - Google Patents
Driving method for local dimming of liquid crystal display device and apparatus using the same Download PDFInfo
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- CN102103840B CN102103840B CN2010102904869A CN201010290486A CN102103840B CN 102103840 B CN102103840 B CN 102103840B CN 2010102904869 A CN2010102904869 A CN 2010102904869A CN 201010290486 A CN201010290486 A CN 201010290486A CN 102103840 B CN102103840 B CN 102103840B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
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- Liquid Crystal Display Device Control (AREA)
Abstract
A driving method for local dimming of a Liquid Crystal Display (LCD) device and an apparatus using the same are disclosed. The driving method includes determining a dimming value of each of a plurality of local dimming blocks into which a backlight unit is divided to be driven on a block basis by analyzing input image data on a block basis, detecting a high gray area concentrated with high gray levels from each local dimming block based on the analysis of the input image data, and generating position information about the high gray area according to a distance between the high gray area in the block and an adjacent block, and compensating the dimming value of each of the plurality of local dimming blocks by spatial filtering using a spatial filter having a different filter size or different filter coefficients for local dimming blocks according to the position information about the high gray area in the local dimming block.
Description
The application requires the right of priority of the korean patent application No.10-2009-0126974 of submission on Dec 18th, 2009, incorporates it into this paper by reference, just as all setting forth at this.
Technical field
The present invention relates to a kind of liquid crystal display (LCD) device, more particularly, relate to a kind of driving method that makes the minimized local dimming of liquid crystal display device of brightness irregularities between the local dimming piece, and the equipment that uses the method.
Background technology
Recently, flat-panel monitor is popular as video display, for example, and liquid crystal display, plasma display (PDP), Organic Light Emitting Diode (OLED) etc.
The LCD device comprises: based on the liquid crystal panel that shows image at the electricity that presents anisotropic liquid crystal aspect specific inductive capacity and the refractive index, light characteristic at picture element matrix; Drive the driving circuit of liquid crystal panel; And the back light unit of irradiation light to the liquid crystal panel.Control the transmissivity that light passes liquid crystal panel and polarizer from back light unit by the orientation that changes liquid crystal according to data-signal, adjust thus the gray level of each pixel.
In liquid crystal indicator, the brightness of each pixel is by the brightness of back light unit and depend on that the product of light transmission of the liquid crystal of data determines.The backlight dimming method that adopts the LCD device realizes increasing the purpose of contrast and minimizing power consumption.Backlight dimming is by analyzing input picture and controlling the technology of backlight illumination and offset data based on this analysis and regulation light modulation value.For example, the backlight dimming method that is intended to reduce power consumption reduces backlight illumination and increases brightness by compensation data by reducing the light modulation value.Therefore, the power consumption of back light unit has reduced.
Use LED to be used as recently back light unit as light emitting diode (LED) back light unit of light source.LED has the advantage of high brightness and low-power consumption with respect to traditional light fixture.Because the LED-backlit unit allows the control based on the part, so it can drive by local dimming.According to the local dimming technology, the LED-backlit unit is divided into a plurality of light-emitting blocks and its brightness is controlled on the basis of block-by-block as the basis take piece.Because back light unit and liquid crystal panel are divided into a plurality of, so local dimming can further increase contrast and reduce power consumption, and the local dimming value is by being determined take piece as the fundamental analysis data, and comes offset data based on the local dimming value.
Although carry out brilliance control according to input picture as the basis take piece, the driving method of local dimming correlation technique leaks the impact that the brightness irregularities that causes is subject to halo effect because of the light of adjacent block.For example, if having an image of greyscale pattern of bright (high grade grey level) in the greyscale pattern of very dark (low gray level) shown by local dimming, then halation phenomenon can occur, wherein because the light leakage, bright in phaeodium as seen, therefore, reduced picture quality.In the situation with the edge-type backlight unit that is arranged in the led array at least two edges, bright greyscale pattern more can perceive the brightness irregularities between the piece the closer to adjacent block.
Summary of the invention
According to an aspect of the present invention, a kind of driving method of local dimming of LCD device comprises: by take piece as the fundamental analysis input image data, determine the light modulation value of each the local dimming piece in a plurality of local dimming pieces, described a plurality of local dimming pieces are divided by back light unit and are formed in order to drive this back light unit take piece as the basis; Based on the analysis to input image data, from each local dimming piece detection set the high gray areas of high grade grey level, and according to the high gray areas in the piece and the distance between the adjacent block, produce the positional information about this high gray areas; And carry out the light modulation value that spatial filtering compensates each the local dimming piece in described a plurality of local dimming piece by the usage space wave filter, wherein this spatial filter has different filter size or different filter coefficient for a plurality of local dimming pieces according to the positional information about the high gray areas in the local dimming piece.
According to a further aspect in the invention, a kind of driving arrangement of local dimming of LCD device comprises: image dissector, this image dissector detects the maximal value of each pixel by analyzing input image data on each the local dimming piece in a plurality of local dimming pieces, and detect the representative gray level of each piece with the maximal value of the pixel in each piece, described a plurality of local dimming pieces are divided by back light unit and are formed in order to drive this back light unit take piece as the basis; Light modulation value determinant, this light modulation value determinant determines the light modulation value take piece as the basis according to the representative gray level of each piece; High gray areas detecting device, this high gray areas detecting device is based on the maximal value of each pixel that receives from this image dissector, from each piece detection set the high gray areas of high grade grey level, and according to the high gray areas in the piece and the distance between the adjacent block, produce the positional information about this high gray areas; And light modulation value compensator, this light modulation value compensator carries out spatial filtering by the usage space wave filter, compensate the light modulation value of each the local dimming piece in described a plurality of local dimming piece, this spatial filter has different filter size or different filter coefficients according to the positional information about the high gray areas in the piece.
The generality that is appreciated that front of the present invention is described and the following detailed description is exemplary with indicative, and being intended to provides further explanation to the present invention for required protection.
Description of drawings
Accompanying drawing comprises a part that consists of in this application the application, is used for to the invention provides further understanding.Accompanying drawing illustrates embodiments of the present invention and is used from explanation principle of the present invention with instructions one.In the accompanying drawings:
Fig. 1 is the schematic block diagram of liquid crystal display (LCD) device according to exemplary embodiment of the invention.
Fig. 2 is the detailed diagram of the local dimming driver shown in Fig. 1.
Fig. 3 illustrates according to exemplary embodiment of the invention, the distance between block-based high grade grey level zone and the adjacent block and the view of the spatial filter used.
Embodiment
To be described with reference to preferred implementation of the present invention in detail now, shown in the drawings of some examples of these embodiments.In whole accompanying drawing, use as much as possible identical reference marker to represent same or analogous parts.
Fig. 1 is the schematic block diagram of liquid crystal indicator according to an illustrative embodiment of the invention.
Referring to Fig. 1, the LCD device comprises: by determining the local dimming value take piece as the fundamental analysis input image data and coming the local dimming driver 10 of offset data according to the local dimming value; To offer from the data that local dimming driver 12 receives the time schedule controller 20 of the driving sequential of panel driver 22 and control panel driver 22; Drive the backlight driver 30 of light emitting diode (LED) back light unit 40 as the basis take piece based on the local dimming value that receives from local dimming driver 10; And by the data driver 24 of panel driver 22 and the liquid crystal panel 28 of gate driver 26 drivings.Local dimming driver 10 can be arranged in the time schedule controller 20.
In operation, local dimming driver 10 utilizes synchronizing signal take piece as the fundamental analysis input image data, and determines the light modulation value of each piece according to analysis result.The light modulation value that local dimming driver 10 compensates each piece first is adjacent light modulation deviation (being luminance deviation) between the piece to reduce piece.Finish above-mentioned first compensation by utilizing spatial filter that the light modulation value of piece and adjacent block thereof is carried out spatial filtering, this spatial filter has corresponding to the filter size of piece and adjacent block thereof and the filter coefficient that is respectively a plurality of settings.Has concrete weighted value (namely by utilization, be used for piece and be positioned at the concrete filter coefficient of adjacent block of the upper and lower, left and right of this piece) thus spatial filter when carrying out the light modulation value of filtering compensation block, spatial filtering can make light modulation value (the being brightness) difference between the piece diminish.
More specifically, local dimming driver 10 will concentrate the high gray areas of high grade grey level to be arranged in each piece, and the position according to this high gray areas, namely, be adjacent distance between the piece according to the high gray areas of a piece, use different filter size or different spatial filter coefficients, thus the light modulation value of compensation block first.The high gray areas of if block is away from adjacent block, and it means, the brightness of this high gray areas little effect adjacent block, and then local dimming driver 10 arranges less spatial filter size.Opposite, the high gray areas of if block is near adjacent block, and it means that this high gray areas affects the brightness of adjacent block significantly, then local dimming driver 10 increases spatial filter size and the filter coefficient of adjacent block, thereby further reduces the brightness irregularities between the piece.
In addition, local dimming driver 10 calculates the first yield value of each pixel in each piece according to the light modulation value of piece, and compensates input image data by multiply by input image data with the first yield value.
20 pairs of data that receive from local dimming driver 10 of time schedule controller sort, and the data that sort are outputed to the data driver 24 of panel driver 22.A plurality of synchronizing signals that time schedule controller 20 usefulness receive from local dimming driver 10 generate for the data controlling signal of the driving sequential of control data driver 24 and the gate control signal that is used for the driving sequential of control gate driver 26, and respectively data controlling signal and gate control signal are outputed to data driver 24 and gate driver 26, wherein these synchronizing signals are specially vertical synchronizing signal, horizontal-drive signal, data enable signal and Dot Clock signal.Simultaneously, time schedule controller 20 can further comprise the overdrive circuit (not shown), and it comes modulating data by according to the data difference between the successive frame overshoot value or undershoot value being applied to data, to increase the response speed of liquid crystal.
In response to the data controlling signal that receives from time schedule controller 20, data driver 24 utilizes gamma electric voltage will convert from the digital of digital video data that time schedule controller 24 receives analog data signal (pixel voltage signal) to, and analog data signal is offered the data line DL of liquid crystal panel 28.
Use the back light unit 40 of direct-light type LED backlight unit or marginal mode LED-backlit unit to be divided into a plurality of by backlight driver 30, and when driven, project light onto on the liquid crystal panel 28 as basic take piece when back light unit 40.The led array of direct-light type LED backlight unit is arranged in the whole viewing area in the face of liquid crystal panel 28, yet the led array of marginal mode LED-backlit unit is arranged as at least two edges in the face of light guide plate (this light guide plate in the face of liquid crystal panel 28), and is converted into planar light source and is irradiated on the liquid crystal panel 28 from the line source of led array.
According to the local dimming value of each piece that receives from local dimming driver 10, backlight driver 30 drives back light unit 40 take piece as the basis, thereby take the brightness of piece as base control back light unit 40.If back light unit 40 is divided into a plurality of ports and driven as the basis take port, then a plurality of backlight drivers 30 can be used for driving independently a plurality of ports.For each piece, backlight driver 30 produces width modulation (PWM) signal with dutycycle corresponding with the local dimming value of piece, and will offer piece corresponding to the LED driving signal of pwm signal.Therefore, back light unit 40 is driven as the basis take piece.Drive light-emitting block by connecting sequence ground based on the local dimming value that receives from local dimming driver 10 according to piece, backlight driver 30 is take the brightness of piece as base control back light unit 40.
Therefore, LCD device according to the present invention shows input image data with the final brightness that is obtained of multiplying each other by the light transmission with Data Control after the brightness of the back light unit take piece as base control and the compensation that utilizes in the liquid crystal panel 28.
Fig. 2 is the detailed diagram of the local dimming driver 10 shown in Fig. 1.
Referring to Fig. 2, local dimming driver 10 comprises image dissector 102, light modulation value determinant 104, high gray areas detecting device 106, the first light modulation value compensator 110, the second light modulation value compensators, 124, the first data compensator 120 and the second data compensator 122.The first light modulation value compensator 110 comprises a plurality of spatial filters 112,114 and 116, and selector switch 118.
Light modulation value determinant 104 is determined the local dimming value of each piece according to the representative gray level of piece, and the local dimming value of piece is outputed to the first light modulation value compensator 110 and the first data compensator 120.Particularly, light modulation value determinant 104 is that each piece is selected the light modulation value corresponding to representative gray level from default look-up table.
By maximal value and the threshold with each pixel of piece, high gray areas detecting device 106 detects and concentrates the high gray areas that has above the high grade grey level of threshold value in each piece, detection is about the positional information of high gray areas, and will indicate high gray areas detection detection signal and output to the first light modulation value compensator 110 about the positional information of high gray areas.For example, shown in Fig. 3 (A), 3 (B) and 3 (C), limit first, second, and third position of high gray areas (white portion) according to the distance between high gray areas and the top adjacent block, and positional information about high gray areas is set to indicate one of first, second, and third position.Positional information and detection signal are transmitted to the first light modulation value compensator 110 together.Simultaneously, do not detect high gray areas in the if block, high gray areas detecting device 106 will not detect signal and will output to the first light modulation value compensator 110.
The first light modulation value compensator 110 is processed the local dimming value that receives from light modulation value determinant 104 by carrying out spatial filtering with a plurality of spatial filters 112,114 and 116 with different filter coefficients, thereby compensates first the local dimming value as the basis take piece.The first light modulation value compensator 110 is selected one of spatial filter 112, output of 114 and 116 in response to the detection signal that receives from high gray areas detecting device 106 with about the positional information of high gray areas, and exports the selected second light modulation value compensator 124 that exports to.The first light modulation value compensator 110 is used different filter size and different filter coefficients according to the high gray areas of a piece from the distance between the adjacent block.Therefore, the distance between the high gray areas in the if block and the led array changes, and then the first light modulation value compensator 110 adaptability ground alleviate the brightness irregularities between the piece.
Shown in Fig. 3 (A), 3 (B) and 3 (C), for example, limiting in the situation of first, second, and third position of high gray areas in this piece according to the distance between the high gray areas of a piece and the upper mass adjacent with this piece, the first light modulation value compensator 110 comprises three spatial filters 112,114 and 116 with different filter coefficients.
The first spatial filter 112 is used for the high gray areas of primary importance, namely, and from top adjacent block distance high gray areas farthest, shown in Fig. 3 (A).The first spatial filter 112 by to a plurality of adopt 3 * 1 sizes and identical filter coefficient carry out filtering come compensation block first with and the light modulation value of left and right adjacent block.Selector switch 118 is in response to the output of primary importance Information Selection the first spatial filter 112 that receives from high gray areas detecting device 106, and selected output is outputed to the second light modulation value compensator 124.
Second space wave filter 114 is used for the high gray areas of the second place, namely, is the high gray areas of intermediate distance from the distance of top adjacent block, shown in Fig. 3 (B).Second space wave filter 114 carries out the light modulation value that filtering compensates the adjacent block of the right adjacent block of left adjacent block, this piece of a piece, this piece and this three pieces tops first by 3 * 3 sizes that are adopted as six pieces and arrange and predetermined filter coefficient.Selector switch 118 outputs to the second light modulation value compensator 124 in response to the output of the second place Information Selection second space wave filter 114 that receives from high gray areas detecting device 106 and with selected output.
The 3rd spatial filter 116 is used for the high gray areas of the 3rd position, namely, and from the nearest high gray areas of top adjacent block, shown in Fig. 3 (C).The 3rd spatial filter 116 carries out the light modulation value that filtering compensates the adjacent block of the right adjacent block of left adjacent block, this piece of a piece, this piece and this three pieces tops first by 3 * 3 sizes that are adopted as six pieces and arrange and predetermined filter coefficient.Selector switch 118 is selected the output of the 3rd spatial filter 116 and selected output is outputed to the second light modulation value compensator 124 in response to the 3rd positional information that receives from high gray areas detecting device 106.
From Fig. 3 it may be noted that when the high gray areas of piece from the top adjacent block more away from the time, the spatial filter size is less, and under identical spatial filter size, the filter coefficient of the upper mass adjacent with the piece with high gray areas reduces.In this manner, if the distance between the high gray areas of a piece and the adjacent block changes, then the first light modulation value compensator 110 changes spatial filter size and the filter coefficient of piece and adjacent block thereof.
Local dimming value by using the piece that receives from light modulation value determinant 104 and the light of default light source distribute (profile), the first data compensator 120 is the first yield value take pixel as basic calculation, compensate first rear input image data by the first yield value is applied to input image data, and will compensate first rear data and output to the second data compensator 122.More specifically, the first data compensator 120 makes in the situation that all is in high-high brightness backlight that using up distributes calculates the first total light intensity that arrives each pixel; By local dimming take piece in the situation of base control backlight illumination, make to use up to distribute and a plurality of local dimming value is calculated second total light intensity of arrival pixel; And the ratio of calculating second total light intensity and first total light intensity is used as the first yield value of pixel.Then the first data compensator 120 compensates first the brightness that the local dimming in the input image data causes and reduces by the first yield value and input image data are multiplied each other.
The second data compensator 122 detects each that receive from the first data compensator 120 and compensates first the maximal value of the data of rear frame, thereby the second yield value is converted to maximum gray scale (for example 255) with the maximal value that detects take frame as basic calculation, and compensates for the second time and compensate first afterwards data by the second yield value being applied to after the first compensation data.Data output to time schedule controller 20 after for the second time compensation of the second data compensator 122, and the second yield value of each frame is outputed to the second light modulation value compensator 124.
The second light modulation value compensator 124 compensates light modulation value after the first compensation of each piece for the second time by the second yield value being applied to first light modulation value after the compensation, and the light modulation value outputs to backlight driver 30 after for the second time compensation.
As described above, if the distance between the high gray areas of a piece and the adjacent block changes, then can be by changing spatial filter size and filter coefficient according to LCD device of the present invention, alleviate brightness irregularities between the piece according to the position of high gray areas in the piece.
Although described illustrative embodiments of the present invention is take edge-type backlight unit as example, be appreciated that the present invention also may be used on direct-type backlight unit.
High-visible from the above description, by spatial filter size and filter coefficient that high gray areas and the distance between the adjacent block according to piece change piece, compensate the light modulation value of each piece according to the driving method of LCD device local dimming of the present invention and equipment.Therefore, can alleviate brightness irregularities between the piece according to the distance between high gray areas and the adjacent block.
In the situation that does not break away from the spirit or scope of the present invention, can carry out various modifications and variations to the present invention, this is apparent for one of ordinary skill in the art.Thereby, the invention is intended to cover fall in appended claims scope and the equivalent scope thereof to all modifications of the present invention and variation.
Claims (10)
1. the driving method of the local dimming of a liquid crystal indicator comprises:
By take piece as the fundamental analysis input image data, determine the light modulation value of each the local dimming piece in a plurality of local dimming pieces, described a plurality of local dimming pieces are divided by back light unit and are formed in order to drive this back light unit take piece as the basis;
Based on the analysis to input image data, from each local dimming piece detection set the high gray areas of high grade grey level, and according to the high gray areas in the piece and the distance between the adjacent block, produce the positional information about this high gray areas;
Carry out the light modulation value that spatial filtering compensates each the local dimming piece in described a plurality of local dimming piece by the usage space wave filter, wherein this spatial filter has different filter size or different filter coefficient for a plurality of local dimming pieces according to the positional information about the high gray areas in the local dimming piece; And
Distribute take pixel as basic calculation the first yield value by the light with the light modulation value of local dimming piece and default light source, and be applied to input image data by the first yield value with pixel and compensate described input image data,
Wherein said the first yield value is calculated as the ratio of second total light intensity and first total light intensity, described first total light intensity is for making total light intensity of each pixel of arrival that using up distributes calculates in the situation that all is in high-high brightness backlight, described second total light intensity for by local dimming take piece in the situation of base control backlight illumination, make to use up to distribute and the light modulation value of a plurality of local dimming pieces and total light intensity of the arrival pixel calculated.
2. driving method according to claim 1 also comprises:
The second yield value take frame as basic calculation, this second yield value is used for the maximal value of view data after the compensation of a frame is converted to the representative maximum gray scale of input image data, and is applied to after the compensation view data by the second yield value with a plurality of frames and comes to compensate for the second time view data after the described compensation; And
Come to compensate for the second time local dimming value after the described compensation by local dimming value after the compensation that the second yield value is applied to the local dimming piece.
3. driving method according to claim 2, high gray areas and the distance between the adjacent block in one of them piece are larger, and employed spatial filter size is less.
4. driving method according to claim 2, high gray areas and the distance between the adjacent block in one of them piece are larger, and employed filter coefficient for piece is less.
5. driving method according to claim 2 also comprises:
View data offers liquid crystal panel after the compensation for the second time; And
By coming to drive this back light unit take piece as the basis with light modulation value after the compensation second time of local dimming piece, take the brightness of piece as this back light unit of base control.
6. the driving arrangement of the local dimming of a liquid crystal indicator comprises:
Image dissector, this image dissector detects the maximal value of each pixel by analyzing input image data on each the local dimming piece in a plurality of local dimming pieces, and detect the representative gray level of each piece with the maximal value of the pixel in each piece, described a plurality of local dimming pieces are divided by back light unit and are formed in order to drive this back light unit take piece as the basis;
Light modulation value determinant, this light modulation value determinant determines the light modulation value take piece as the basis according to the representative gray level of each piece;
High gray areas detecting device, this high gray areas detecting device is based on the maximal value of each pixel that receives from this image dissector, from each piece detection set the high gray areas of high grade grey level, and according to the high gray areas in the piece and the distance between the adjacent block, produce the positional information about this high gray areas;
Light modulation value compensator, this light modulation value compensator carries out spatial filtering by the usage space wave filter, compensate the light modulation value of each the local dimming piece in described a plurality of local dimming piece, this spatial filter has different filter size or different filter coefficients according to the positional information about the high gray areas in the piece; And
Data compensator, the light modulation value of the local dimming piece that this data compensator utilization receives from this light modulation value determinant and the light of default light source distribute take pixel as basic calculation the first yield value, and be applied to input image data by the first yield value with pixel and compensate described input image data
Wherein said data compensator makes in the situation that all is in high-high brightness backlight that using up distributes calculates the first total light intensity that arrives each pixel; By local dimming take piece in the situation of base control backlight illumination, make to use up to distribute and the light modulation value of a plurality of local dimming pieces is calculated second total light intensity of arrival pixel; And the ratio of calculating described second total light intensity and described first total light intensity is used as described the first yield value.
7. driving arrangement according to claim 6 also comprises:
The second data compensator, this second data compensator is the second yield value take frame as basic calculation, this second yield value is used for the representative maximum gray scale that the maximal value of view data after the compensation of the frame that will receive from this view data compensator is converted to input image data, and this second data compensator is applied to after the compensation view data by the second yield value with frame and comes to compensate for the second time view data after the described compensation; And
The second light modulation value compensator, this second light modulation value compensator by the compensation that will be applied to from the second yield value that this second data compensator receives the local dimming piece after the local dimming value come to compensate for the second time local dimming value after the described compensation.
8. driving arrangement according to claim 7, high gray areas and the distance between the adjacent block in one of them piece are larger, and employed spatial filter size is less.
9. driving arrangement according to claim 7, wherein high gray areas and the distance between the adjacent block in a piece is larger, and the filter coefficient that is used for piece is less.
10. driving arrangement according to claim 7 also comprises:
Panel driver, this panel driver offers liquid crystal panel with the rear view data of the second compensation; And
Backlight driver, this backlight driver is by coming to drive this back light unit take piece as the basis with light modulation value after the compensation second time of local dimming piece, take the brightness of piece as this back light unit of base control.
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| KR10-2009-0126974 | 2009-12-18 | ||
| KR1020090126974A KR101611913B1 (en) | 2009-12-18 | 2009-12-18 | Method for driving local dimming of liquid crystal display device and apparatus thereof |
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| CN102103840A CN102103840A (en) | 2011-06-22 |
| CN102103840B true CN102103840B (en) | 2013-03-06 |
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| CN2010102904869A Active CN102103840B (en) | 2009-12-18 | 2010-09-20 | Driving method for local dimming of liquid crystal display device and apparatus using the same |
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| US (1) | US8531385B2 (en) |
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| KR101611913B1 (en) | 2016-04-14 |
| US20110148941A1 (en) | 2011-06-23 |
| US8531385B2 (en) | 2013-09-10 |
| CN102103840A (en) | 2011-06-22 |
| KR20110070235A (en) | 2011-06-24 |
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